A Bag of Gold

This is part of a little secret in the dungeon journal. The entire sequence takes five weeks to complete.

Each week (after reset), open your Adventure Guide (Shift+J), select the "Suggested Content" tab, and in the left pane scroll all the way to the right. You'll get one of these quests, in order:

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• Week 1 - A Piece of Copper - Rewards 1c and the achievement Lucky Penny.
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• Week 2 - A Piece of Silver - Rewards 1s
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• Week 3 - A Piece of Gold - Rewards 1g
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• Week 4 - A Bag of Gold - Rewards 10g
  
• Week 5 - A Curious Coin - Rewards [item=202107], the achievement Curious Coin, and a message from our mysterious benefactor.
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If you'd like to know what the final message says, I've posted it on Twitter since Wowhead doesn't have it in the database yet.

"Why would someone give away this gold? And if they have access to your Adventure Guide, what else do they have access to?"

What else, indeed...